1. A mild earthquake occurred in near Washington D.C. at 8.00 Greenwich Mean Time. The shock was registered on seismograms in different cities at the times shown below. Plot a graph showing travel time versus distance for both P and S-waves.
city Distance(km) P-wave arrival time S-wave arrival time
Buenos Aires 8640 710 1302
Cairo Egypt 9590 757 1392
Bogota Colombia 4840 485 865
Chicago 988 144 212
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